var obj = new Proxy({}, {
    get: function(target, key, receiver) {
        console.log(`getting ${key}!`);
        return Reflect.get(target, key, receiver);
    },
    set: function(target, key, value, receiver) {
        console.log(`setting ${key}!`);
        return Reflect.set(target, key, value, receiver);
    }
});